PROBLEM TO BE SOLVED: To provide a solid oxide fuel battery cell having durability, by suppressing separation of an air electrode, while the separation of the air electrode has been observed when the air electrode containing a perovskite oxide is exposed to a reducing atmosphere at the stop of operation, especially shutdown.SOLUTION: In a solid oxide fuel battery cell, an air electrode is obtained by firing a compact containing a perovskite oxide and a sulfur element, and the content of the sulfur element in the air electrode immediately after firing or before the start of power generation is in the range of 50 ppm to 3,000 ppm inclusive. The separation of the air electrode is effectively suppressed at the shutdown.